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Test Bench for PEM Electrolysis Stacks

Research institutions and development departments face the challenge of conducting reproducible and realistic tests under industrial operating conditions when developing PEM electrolysers. Many existing test systems are either limited to low pressures and low power outputs or do not allow for the full integration of electrochemical characterization, process monitoring, and safety functions.

Added to this is the need for high flexibility for varying cell and stack configurations, as well as safe 24/7 continuous operation without time-consuming manual monitoring. A lack of automation, limited measurement capabilities (e.g., EIS or single-cell monitoring), and complex operating concepts delay development processes and make it difficult to compare measurement results.

The PEM electrolysis test bench closes exactly this gap as it enables highly precise, safe, and fully automated testing of individual cells and short stacks under real-world pressure, temperature, and current conditions - compact, flexible, and user-friendly.

Key features

Realistic test conditions: Testing of PEM cells and short stacks under industrial-scale pressure, temperature, and current conditions

High flexibility: Support for variable cell and stack configurations

Comprehensive analysis: Combination of process data acquisition and electrochemical diagnostics

Safe & reliable: Fully integrated safety concept for unattended continuous operation

Customizable: Modular design and customer-specific automation and interface solutions

Proven technology: Benefit from over 20 years of experience in hydrogen and test bench construction

Fully automated testing with user programming of complex test profiles

Monitoring of up to 10 individual cell voltages

Enclosed transparent test chamber with integrated safety systems

Technical specifications

Electrical Performance

Cell/stack voltage: ≥ 24 V
Current: ≥ 250 A
Power: up to 10 kW (datasheet: up to 5 kW)
Monitoring of up to 10 individual cell voltages

Pressure & Media

Cathode side: up to ≥ 50 bar
Anode side: up to ≥ 20 bar
DI water supply with ion exchanger
Anode water circuit: > 0.050 l/min to ≥ 1.0 l/min
Tank feed pump: ≥ 0.2 l/min (up to 30 bar)

Measurement & Analysis Systems

Current-voltage characteristics
Galvanostatic and potentiostatic measurements
Electrochemical impedance spectroscopy (EIS)
Mass flow measurement (anode/cathode)
Temperature, conductance, and pressure measurement

Safety & Operation

Integrated hydrogen and oxygen sensors
Nitrogen purging for anode and cathode chambers (all pressure ranges)
24/7 intrinsically safe operation
Enclosed transparent test chamber
Emergency stop switch, warning lights, external safety I/Os

Mechanics & Design

Dimensions: ≤ 2 × 1 × 2 m (D × W × H)
PC workstation included
User programming of complex test profiles possible

Test Bench for PEM Electrolysis Stacks